comp.os.linux.networking

"Pascal Hambourg" wrote in message
news:fqm0mj$hi4$1@biggoron.nerim.net...
> D. Stussy a écrit :
> >
> > Also, if you don't put the 6to4
> > address on the sit0 interface, it does work but the route that gets
> > auto-added (for other than a /128) gets added to the wrong interface and
the
> > auto-lookup for the embedded IPv4 remote tunnel end breaks, unless you
also
> > manually add "2002::/16" to sit0.
>
> Of course the sit interface must have the 2002::/16 route. I did not say
> otherwise. This does not mean that the sit interface must have a 6to4
> address or other interfaces must not have 6to4 addresses.
>
> > However, you still need the 2002::/16 route on sit0 for it to work with
> > OTHER PEOPLE's 6to4 addresses.
>
> Correct.
>
> > Additionally, you will have at least one
> > address for your local host, and it really belongs on sit0
>
> No, it can be assigned to any interface. If the output interface has no
> suitable address, the network stack will use a suitable address from
> another interface. I.e. if you assigned a 6to4 address only to the LAN
> interface, this address can be used for communications on the sit
interface.
>
> > = so no reason not to "ifconfig sit0 inet6 add 2002:xxxx:xxxx::1\16"
> > where it's supposed to be.
>
> One reason : it is not required when the host already has a 6to4 address
> assigned to another interface.
> Besides, why assign 2002:xxxx:xxxx::1 and not any other address in your
> 6to4 prefix such as 2002:xxxx:xxxx::, 2002:xxxx:xxxx::2,
> 2002:xxxx:xxxx:1234:5678:9abc:dead:beef... ?
>
> > Unlike IPv4, an interface can have multiple IPv6 addresses assigned to
> > it.
>
> You mean *like* IPv4. An interface can have multiple IPv4 addresses. Do
> not let ifconfig fool you.
>
> $ ip addr show dev eth0
> 2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000
> link/ether 00:e0:29:04:b6:61 brd ff:ff:ff:ff:ff:ff
> inet 192.168.0.1/24 brd 192.168.0.255 scope global eth0
> inet 192.168.100.1/24 brd 192.168.0.255 scope global eth0:0
> inet6 2001:7a8:6d23:1::1/64 scope global
> inet6 2002:d529:ad23:1::1/64 scope global
> inet6 fe80::2e0:29ff:fe04:b661/64 scope link

That doesn't work on my system. To assign a second IPv4, I have to use
"eth0:1", "eth0:2", etc., i.e. a virtual extension interface.